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Reports string concatenations with missing whitespaces, that is where the left-hand side
ends with a Unicode letter or digit and the right-hand side starts with a Unicode letter or digit.
<p><b>Example:</b></p>
<pre><code>
  String sql = "SELECT column" +
               "FROM table";
</code></pre>
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<p>
  Use the <b>Ignore concatenations with variable strings</b> option to only report
  when both the left and right side of the concatenation are literals.
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